JPH0132635Y2 - - Google Patents

Description

【考案の詳細な説明】 この考案は、アンチノーズダイブ機構を備えた
フロントフオークの改良に関する。[Detailed Description of the Invention] This invention relates to an improvement of a front fork equipped with an anti-nose dive mechanism.

自動二輪車の走行中に制動をかけると、慣性で
搭乗者の体重がハンドルに加えられてフロントフ
オークの内筒が外筒に沈み込むため操縦の安定性
が損われる。このため沈み込み防止機構、つまり
アンチノーズダイブ機構を設けたフロントフオー
クが種々開発されている。 When a motorcycle is braked while it is running, the rider's weight is added to the handlebars due to inertia, causing the inner cylinder of the front fork to sink into the outer cylinder, impairing steering stability. For this reason, various front forks have been developed that are equipped with a sinking prevention mechanism, that is, an anti-nose dive mechanism.

この種のものに、外筒の側部に付設ケースを取
付け、該ケース内に外筒底部に植設したシートパ
イプの内外の油室を連絡する油路を穿設し、該油
路内に自動二輪車の制動時に閉動作し、かつシー
トパイプ外側油室内の油圧上昇時に開動作する開
閉弁を設けたものがある。上記付設ケースは別体
に製作され外筒の側部に取付けられるものである
ため、大型化するのは好ましくない。一方、シー
トパイプの基端部にオイルロツクピースを外嵌
し、フロントフオークの最圧縮時にシートパイプ
外側油室内の作動油が上記付設ケース内の油路を
介してシートパイプ内側油室内へ流入する油路を
任意位置で遮断し、シートパイプ外側油室内に封
入された作動油が内筒先端にて圧縮されて、あた
かも剛体の如く作用し、それ以上の内筒の下降を
阻止して内筒と外筒が衝突するのを防止するオイ
ルロツク機構を備えている。このオイルロツクス
ペースを確保するため、上記シートパイプ外側油
室と付設ケースの油路入口とを連通する外筒の油
孔は高位置であるほど良い。というのは、付設ケ
ース内の油路に設けられた開閉弁は油圧上昇時に
開動作して高圧油を逃がす仕組みであるため、上
記油孔が低位置にあるとその位置より下方でしか
オイルロツクが効かず、オイルロツクスペースが
確保され難いという間題があるためである。しか
しながら反面、同油孔を高位置に穿設すると付設
ケースの油路入口も高くなり出口との間隔も長く
なるため該付設ケースが大型化するという間題が
あつた。 In this type of product, an attached case is attached to the side of the outer cylinder, and an oil passage is bored inside the case to connect the inner and outer oil chambers of the sheet pipe installed at the bottom of the outer cylinder. Some motorcycles are equipped with an on-off valve that closes when the motorcycle is braked and opens when the oil pressure in the oil chamber outside the seat pipe increases. Since the attached case is manufactured separately and attached to the side of the outer cylinder, it is undesirable to increase its size. On the other hand, an oil lock piece is fitted externally to the base end of the seat pipe, and when the front fork is fully compressed, the hydraulic oil in the seat pipe's outer oil chamber flows into the seat pipe's inner oil chamber through the oil passage in the attached case. The oil passage is blocked at an arbitrary position, and the hydraulic oil sealed in the oil chamber on the outside of the seat pipe is compressed at the tip of the inner cylinder, acting as if it were a rigid body, preventing the inner cylinder from descending any further and closing the inner cylinder. It is equipped with an oil lock mechanism that prevents the outer cylinder from colliding with the cylinder. In order to secure this oil lock space, the higher the position of the oil hole in the outer cylinder which communicates the seat pipe outer oil chamber and the oil passage inlet of the attached case, the better. This is because the on-off valve installed in the oil passage in the attached case opens when the oil pressure rises, allowing high-pressure oil to escape, so if the oil hole is at a low position, the oil lock will only occur below that position. This is because there is a problem that it is not effective and it is difficult to secure oil lock space. However, on the other hand, if the oil hole is drilled at a high position, the entrance of the oil passage in the attached case will also be high and the distance from the outlet will become longer, resulting in a problem that the attached case will become larger.

この考案は上記間題の解消を目的とするアンチ
ノーズダイブ機構を備えたフロントフオークを提
案するもので、上記シートパイプ外側油室と付設
ケースの油路入口とを連通する外筒の油孔を、シ
ートパイプ外側油室に接続される側を高位置に、
付設ケースの油路入口に接続される側を低位置に
なるように段差をつけて穿設したことを要旨とす
る。 This idea proposes a front fork equipped with an anti-nose dive mechanism with the aim of solving the above problem. , place the side of the seat pipe connected to the outer oil chamber in a high position,
The gist is that the side of the attached case connected to the oil passage inlet is leveled and bored so that it is at a lower position.

以下、この考案の一実施態様を添付図面に基づ
いて説明する。 Hereinafter, one embodiment of this invention will be described based on the accompanying drawings.

１は内筒であり、その上端を自動二輪車のハン
ドルに取付けられている。２は内筒１下部を摺動
自在に内嵌した外筒であり、該外筒２の底面より
植設したシートパイプ３の上端を内筒１の内側に
摺動自在に嵌合して、シートパイプ３の上端と内
筒１の上部との間に車体懸架ばね４を張架してい
る。また内部は作動油が充填されている。なお、
５は前輪の軸を嵌合する取付孔、６はオイルシー
ル、７は内筒１の下端に設けられた逆止弁、８は
シートパイプ３の上部に穿設されたオリフイス、
９はシートパイプ３の基端部に外嵌されたオイル
ロツクピース、１０は外筒２との嵌合面に装着さ
れたＯリング、１１はオイルロツクピース９の上
端に皿ばね１２で押圧された環状の逆止弁、１３
はシートパイプ３の下部に、１４はオイルロツク
ピース９に各々穿設された油孔を示す。 Reference numeral 1 denotes an inner cylinder, the upper end of which is attached to the handlebar of a motorcycle. 2 is an outer cylinder into which the lower part of the inner cylinder 1 is slidably fitted; the upper end of the sheet pipe 3 planted from the bottom of the outer cylinder 2 is slidably fitted inside the inner cylinder 1; A vehicle suspension spring 4 is stretched between the upper end of the seat pipe 3 and the upper part of the inner cylinder 1. The inside is also filled with hydraulic oil. In addition,
5 is a mounting hole into which the front wheel shaft is fitted, 6 is an oil seal, 7 is a check valve provided at the lower end of the inner cylinder 1, 8 is an orifice drilled in the upper part of the seat pipe 3,
9 is an oil lock piece fitted onto the base end of the seat pipe 3; 10 is an O-ring attached to the fitting surface with the outer cylinder 2; 11 is pressed against the upper end of the oil lock piece 9 by a disc spring 12; annular check valve, 13
14 indicates an oil hole drilled in the lower part of the seat pipe 3, and 14 indicates an oil hole drilled in the oil lock piece 9.

一方、外筒２側部にはＯリング１５，１６を介
して付設ケース１７が固定され、該ケース１７内
に円筒状の油路１８が穿設されている。該油路１
８はその上部の入口を、外筒２側部に穿設した油
孔２ａを介して上記シートパイプ３の外側油室に
連通されている。また同油路１８の下部出口は、
外筒２側部の油孔２ａ下方に穿設された油孔２ｂ
を介して上記油孔１４，１３により同パイプ３の
内側油室に連絡されている。油孔２ａは、シート
パイプ３の外側油室に接続される側を高位置に、
付設ケース１７の油路１８入口に接続される側を
低位置になるように段差をつけて穿設されてい
る。 On the other hand, an attached case 17 is fixed to the side of the outer cylinder 2 via O-rings 15 and 16, and a cylindrical oil passage 18 is bored inside the case 17. The oil path 1
8 has its upper inlet communicated with the outer oil chamber of the sheet pipe 3 via an oil hole 2a bored in the side of the outer cylinder 2. In addition, the lower outlet of the oil passage 18 is
Oil hole 2b drilled below oil hole 2a on the side of outer cylinder 2
The oil holes 14 and 13 communicate with the inner oil chamber of the pipe 3 via the oil holes 14 and 13. The oil hole 2a is located at a high position on the side connected to the outer oil chamber of the seat pipe 3.
The side connected to the inlet of the oil passage 18 of the attached case 17 is bored with a step so as to be at a lower position.

また、付設ケース１７上部には軸受部材１９が
内嵌され、該軸受部材１９内にピストン２０を摺
動自在に嵌通せしめ、その下端部を上記油路１８
内に臨ませている。該ピストン２０下部には油路
２０内を摺動する開閉弁２１が摺動自在に外嵌さ
れ、該開閉弁２１はピストン２０上部外周に固設
したばね受２２に上端を支持されたリリーフスプ
リング２３を内装して下方に付勢され、かつ、ピ
ストン２０下部外周に設けられたストツパーリン
グ２４により下動規制されている。また同油路１
８の開閉弁２１の下方に該開閉弁２１に対向して
筒状の弁座２５が内嵌固設され、該弁座２５内を
通つてピストン２０下端と付設ケース１７内底部
に固着されたばね座２６との間にリターンスプリ
ング２７が介在されている。更に、一定距離だけ
移動可能にしたプランジヤー２８を有するプラン
ジヤーケース２９を上記付設ケース１７上端に載
置し、キヤツプ３０にて外嵌螺着し一体化せし
め、かつプランジヤー２８の下端をピストン２０
上端に当接し、同プランジヤー２８の上端をプラ
ンジヤーケース２９内に設けた油室３１に臨ま
せ、該油室３１は自動二輪車の油圧制動機構に連
結された油導管３２と連結する。なお、３３はサ
ークリツプ、３４，３５はＯリング、３６は開閉
弁２１下部外周の縮径段部を示す。 Further, a bearing member 19 is fitted into the upper part of the attached case 17, and a piston 20 is slidably fitted into the bearing member 19, and its lower end is connected to the oil passage 18.
It's coming inside. An on-off valve 21 that slides in the oil passage 20 is slidably fitted on the lower part of the piston 20, and the on-off valve 21 has a relief spring whose upper end is supported by a spring receiver 22 fixed to the outer periphery of the upper part of the piston 20. 23 is installed inside the piston 20 and is urged downward, and its downward movement is restricted by a stopper ring 24 provided on the outer periphery of the lower part of the piston 20. Also, the same oil road 1
A cylindrical valve seat 25 is fitted and fixed under the on-off valve 21 of No. 8, facing the on-off valve 21, and a spring is fixed to the lower end of the piston 20 and the inner bottom of the attached case 17 through the inside of the valve seat 25. A return spring 27 is interposed between the seat 26 and the seat 26. Furthermore, a plunger case 29 having a plunger 28 movable by a certain distance is placed on the upper end of the attached case 17, and is screwed onto the outside of the cap 30 to be integrated, and the lower end of the plunger 28 is attached to the piston 20.
The upper end of the plunger 28 faces an oil chamber 31 provided in the plunger case 29, and the oil chamber 31 is connected to an oil conduit 32 connected to a hydraulic braking mechanism of the motorcycle. Note that 33 is a circlip, 34 and 35 are O-rings, and 36 is a diameter-reducing stepped portion on the lower outer periphery of the on-off valve 21.

上記構成よりなるフロントフオークにおいて、
常時は油導管３２における制動用の油圧が低いた
め、リターンスプリング２７によりピストン２０
は上方に付勢され、該ピストン２０に下動規制さ
れて外嵌した開閉弁２１は弁座２５から離隔され
油路１８を開放している。従つて圧縮行程時は逆
止弁７が上昇し、内筒１下部の作動油が弁７の上
面に形成した半径方向の溝を通つてその上部へ移
動すると共に、シートパイプ３外側油室内の作動
油が油孔２ａ、油路１８、油孔２ｂ，１４，１３
を順次通つて該パイプ３内側油室へ流入し、比較
的小さい減衰力を発生する。また走行中に制動を
かけるとその制動機構の油圧が上昇し、該油圧が
油導管３２を介して油室３１に伝達され、その油
圧でプランジヤー２８が下方へ移動し、ピストン
２０を下方に押圧してリターンスプリング２７を
圧縮せしめる。しかるにピストン２０が下降し、
開閉弁２１を弁座２５に圧接し油路１８を閉鎖す
る。このため搭乗者の慣性によつてハンドルに加
わる荷重で内筒１が外筒２内へ侵入すると、該内
筒１の下部の油が逆止弁７の上面の溝を通つてそ
の上部へ移動すると共に作動油の中へ侵入した内
筒１の代積に相当する油はオリフイス８からシー
トパイプ３の内部へ噴出する。即ち極めて大きな
減衰力が発生するから内筒１の侵入が阻止されて
ハンドルの沈み込みが防止され、安定な操縦性を
維持することができる。かつ、この状態で路面か
ら衝撃を受けると、内筒１に更に荷重が加わつて
その下部のシートパイプ３外側油室内の油圧が著
しく上昇し、開閉弁２１下部外周の縮径段部３６
にてその油圧を受け、前記リターンスプリング２
７よりばね応力を大きく設定したリリーフスプリ
ング２３を圧縮せしめて該開閉弁２１は上方へ移
動し弁座２５から離隔され油路１８を開放する。
従つてシートパイプ３外側油室内の高圧油が油孔
２ａ、油路１８、油孔２ｂ、１４，１３を順次通
つてシートパイプ３内側油室内へ移動し、内筒１
が外筒２内に比較的容易に侵入してこの衝撃を吸
収する。更に、フロントフオークの最圧縮時は、
外筒２側部に穿設された油孔２ａのシートパイプ
３外側油室に接続される側を高位置となしたた
め、その位置に内筒１先端が侵入した時点でシー
トパイプ内外を連絡する油路は遮断され、オイル
ロツクスペースは充分確保され良好に作用する。 In the front fork with the above configuration,
Since the braking oil pressure in the oil conduit 32 is normally low, the piston 20 is
is urged upward, and an on-off valve 21 fitted externally with its downward movement restricted by the piston 20 is separated from the valve seat 25 and opens the oil passage 18. Therefore, during the compression stroke, the check valve 7 rises, and the hydraulic oil in the lower part of the inner cylinder 1 moves to the upper part through the radial groove formed on the upper surface of the valve 7, and the oil in the outer oil chamber of the seat pipe 3 moves to the upper part. Hydraulic oil is in oil hole 2a, oil path 18, oil hole 2b, 14, 13
The oil flows into the inner oil chamber of the pipe 3 sequentially, and generates a relatively small damping force. Furthermore, when braking is applied while driving, the hydraulic pressure of the braking mechanism increases, and this hydraulic pressure is transmitted to the oil chamber 31 via the oil conduit 32, and the plunger 28 moves downward with the hydraulic pressure, pushing the piston 20 downward. to compress the return spring 27. However, the piston 20 descends,
The on-off valve 21 is pressed against the valve seat 25 to close the oil passage 18. Therefore, when the inner cylinder 1 enters the outer cylinder 2 due to the load applied to the handle due to the inertia of the passenger, the oil in the lower part of the inner cylinder 1 moves to the upper part of the check valve 7 through the groove on the upper surface of the check valve 7. At the same time, the oil equivalent to the charge volume of the inner cylinder 1 that has entered the hydraulic oil is ejected from the orifice 8 into the interior of the sheet pipe 3. That is, since an extremely large damping force is generated, intrusion of the inner cylinder 1 is prevented, the handlebar is prevented from sinking, and stable maneuverability can be maintained. In addition, when an impact is received from the road surface in this state, further load is applied to the inner cylinder 1, and the oil pressure inside the outer oil chamber of the seat pipe 3 at the lower part of the inner cylinder 1 increases significantly, causing the diameter-reducing step 36 on the outer periphery of the lower part of the on-off valve 21 to increase.
receives the hydraulic pressure, and the return spring 2
By compressing the relief spring 23 whose spring stress is set larger than that of 7, the on-off valve 21 moves upward and is separated from the valve seat 25 to open the oil passage 18.
Therefore, the high-pressure oil in the outer oil chamber of the seat pipe 3 passes through the oil hole 2a, the oil passage 18, the oil holes 2b, 14, and 13 in order, moves into the inner oil chamber of the seat pipe 3, and is transferred to the inner cylinder 1.
enters into the outer cylinder 2 relatively easily and absorbs this impact. Furthermore, when the front fork is fully compressed,
Since the side of the oil hole 2a drilled in the side of the outer cylinder 2 that is connected to the outer oil chamber of the seat pipe 3 is set at a high position, the inside and outside of the seat pipe are communicated when the tip of the inner cylinder 1 enters that position. The oil passage is blocked and the oil lock space is sufficiently secured for good operation.

この考案によれば上記の如く、構造上の簡単な
改良を加えるだけにもかかわらず、充分なオイル
ロツクスペースを確保し、かつ付設ケースの小型
化も可能ならしめる。また、制動時におけるハン
ドルの沈み込みを防止し、かつその状態で路面か
ら衝撃を受けたときも緩衝作用を維持し得、操安
性、応答性にも優れている。 According to this invention, as described above, despite the addition of simple structural improvements, sufficient oil lock space can be secured and the attached case can be made smaller. It also prevents the steering wheel from sinking during braking, maintains a cushioning effect even when the vehicle receives an impact from the road, and has excellent maneuverability and responsiveness.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの考案の一実施態様を示す一部省略
縦断正面図である。 １……内筒、２……外筒、２ａ，２ｂ……外筒
側部に穿設された油孔、３……シートパイプ、９
……オイルロツクピース、１３，１４……油孔、
１７……付設ケース、１８……油路、２０……ピ
ストン、２１……開閉弁、２２……ばね受、２３
……リリーフスプリング、２４……ストツパーリ
ング、２５……弁座、２７……リターンスプリン
グ、２８……プランジヤー。 FIG. 1 is a partially omitted longitudinal sectional front view showing one embodiment of this invention. 1... Inner cylinder, 2... Outer cylinder, 2a, 2b... Oil hole drilled in the side of the outer cylinder, 3... Sheet pipe, 9
...Oil lock piece, 13,14...Oil hole,
17... Attached case, 18... Oil path, 20... Piston, 21... Open/close valve, 22... Spring receiver, 23
... Relief spring, 24 ... Stopper ring, 25 ... Valve seat, 27 ... Return spring, 28 ... Plunger.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 外筒と内筒を摺動自在に嵌合し、該外筒の底部
より植設したシートパイプ先端を内筒内に摺動自
在に嵌合し、該内筒の下部内周にオイルロツクカ
ラーを内嵌すると共に、前記シートパイプの基端
部にオイルロツクピースを外嵌し、外筒側部にシ
ートパイプ内外の油室を連絡する油路を穿設して
なる付設ケースを取付け、該油路内に自動二輪車
の制動時に閉動作し、かつシートパイプ外側油室
内の油圧上昇時に開動作する開閉弁を設けてなる
フロントフオークにおいて、前記シートパイプ外
側油室と付設ケースの油路入口とを連通し、フロ
ントフオークの圧縮時に内筒の外周により閉塞さ
れる油孔を、シートパイプ外側油室に接続される
側を高位置に、付設ケースの油路入口に接続され
る側を低位置になるように段差をつけて穿設した
ことを特徴とするアンチノーズダイブ機構を備え
たフロントフオーク。 The outer cylinder and the inner cylinder are slidably fitted together, the tip of the sheet pipe planted from the bottom of the outer cylinder is slidably fitted into the inner cylinder, and an oil lock collar is attached to the inner periphery of the lower part of the inner cylinder. At the same time, an oil lock piece is fitted externally to the base end of the seat pipe, and an attached case is attached to the side of the outer cylinder with an oil passage connecting the oil chambers inside and outside the seat pipe. In a front fork that is provided with an on-off valve in the oil passage that closes when the motorcycle is braking and opens when oil pressure rises in the seat pipe outer oil chamber, the seat pipe outer oil chamber and the oil passage inlet of the attached case are connected to each other. The oil hole, which is blocked by the outer periphery of the inner cylinder when the front fork is compressed, is placed in a high position on the side connected to the outer oil chamber of the seat pipe, and in a low position on the side connected to the oil passage inlet of the attached case. The front fork is equipped with an anti-nose dive mechanism, which is characterized by having a stepped hole.